Rollei experimented with adding an integrated rangefinder, but there was not enough room in the camera. They experimented with an external rangefinder mechanism with a turning prism as used in Zeiss Ikon Super Ikontas, but as the production shifted to Singapore this idea was abandoned. Made in Germany Following the preproduction run of 50 pieces, 200 cameras were made for use as advertising and testing samples. After 900 pieces of the regular models had been built by the end of 1966, in 1967 each month 1000 cameras were produced. Until August 1967 all Rollei 35 cameras got the unusual signature "Made in Germany by Rollei – Compur – Gossen – Zeiss", but from then on it became "Made in Germany by Rollei". Further deviations from the first production year were the plastic take-up reel and film rewind bearing, V-shaped grasp for the bottom lock and anti-twist plate for the film cartridge. In September 1968 a special lens cement prevented the previous UV permeability of the Tessar. A variant with a dark-green leather covering was rejected by the sales department, not wanting additional models just 2 years after the sales start. Another prototype with blank adjusting wheels from anodized aluminum proved too expensive to manufacture, however. Made in Singapore With the establishment of the production plant, preparations began for the immediate shift of the Rollei 35 production to Singapore. Since there were no suppliers in Singapore, all parts had to be manufactured there by Rollei or imported from Japan or Europe. The cameras received the engraving "Made by Rollei Singapore". Now licensed lens production ("Made by Rollei") was used instead of the original Zeiss lenses, as well as Nissei exposure meters and Copal leaf shutters (both Japanese manufacturers). The retail price fell continuously because of low labor costs. This did not continue to be a noticeable advantage however, because of reduction in the cost of competing cameras, but unlike Rollei, through increasing use of electronics. The Rollei operation in Singapore closed down in 1981. Entry level models Rollei B 35 and C 35 Preceded by two concept studies, the entry-level model with a triplet lens, the Zeiss Triotar f 3.5 / 40 mm, hit the market in October 1969. Initially, for the first concept study, Compur was asked for a simplified shutter with a limited timing range of 1/30 sec to 1/125 sec, which, however, was not cheap enough for an